====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4332 is trying to acquire lock: ffff0000cec80990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x15c/0x23c fs/jbd2/transaction.c:176 but task is already holding lock: ffff0000f3599ce8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x64/0x300 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 ocfs2_mknod+0xd20/0x212c fs/ocfs2/namei.c:361 vfs_mknod+0x3c4/0x44c fs/namei.c:4040 do_mknodat+0x324/0x558 fs/namei.c:-1 __do_sys_mknodat fs/namei.c:4118 [inline] __se_sys_mknodat fs/namei.c:4115 [inline] __arm64_sys_mknodat+0xb4/0xd0 fs/namei.c:4115 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 -> #4 (sb_internal#3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1897 [inline] sb_start_intwrite include/linux/fs.h:2019 [inline] ocfs2_start_trans+0x20c/0x6f4 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x5d0/0xab0 fs/ocfs2/quota_global.c:848 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7f8/0x212c fs/ocfs2/namei.c:311 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:659 vfs_mkdir+0x314/0x4d8 fs/namei.c:4161 do_mkdirat+0x1b8/0x3ec fs/namei.c:4186 __do_sys_mkdirat fs/namei.c:4201 [inline] __se_sys_mkdirat fs/namei.c:4199 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4199 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 -> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x140/0x1444 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x6dc/0xab0 fs/ocfs2/quota_global.c:871 dqget+0x638/0xa98 fs/quota/dquot.c:1013 __dquot_initialize+0x2e4/0xb30 fs/quota/dquot.c:1542 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1604 ocfs2_get_init_inode+0x140/0x1b4 fs/ocfs2/namei.c:202 ocfs2_mknod+0x7f8/0x212c fs/ocfs2/namei.c:311 ocfs2_mkdir+0x19c/0x51c fs/ocfs2/namei.c:659 vfs_mkdir+0x314/0x4d8 fs/namei.c:4161 do_mkdirat+0x1b8/0x3ec fs/namei.c:4186 __do_sys_mkdirat fs/namei.c:4201 [inline] __se_sys_mkdirat fs/namei.c:4199 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4199 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 -> #2 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x1a0/0x1f88 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 dquot_commit+0x54/0x1c8 fs/quota/dquot.c:535 ext4_write_dquot+0x1b4/0x320 fs/ext4/super.c:6824 ext4_mark_dquot_dirty+0xe8/0x150 fs/ext4/super.c:6901 mark_dquot_dirty fs/quota/dquot.c:400 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:440 __dquot_free_space+0x768/0xaa4 fs/quota/dquot.c:1967 dquot_free_space_nodirty include/linux/quotaops.h:372 [inline] dquot_free_space include/linux/quotaops.h:377 [inline] dquot_free_block include/linux/quotaops.h:388 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6168 [inline] ext4_free_blocks+0x18dc/0x2468 fs/ext4/mballoc.c:6298 ext4_remove_blocks fs/ext4/extents.c:2523 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2707 [inline] ext4_ext_remove_space+0x1978/0x3b98 fs/ext4/extents.c:2955 ext4_ext_truncate+0x170/0x218 fs/ext4/extents.c:4499 ext4_truncate+0xa00/0x1090 fs/ext4/inode.c:4305 ext4_setattr+0xe34/0x15e4 fs/ext4/inode.c:5701 notify_change+0xb5c/0xe20 fs/attr.c:499 do_truncate+0x188/0x20c fs/open.c:65 handle_truncate fs/namei.c:3336 [inline] do_open fs/namei.c:3681 [inline] path_openat+0x21c8/0x27a0 fs/namei.c:3838 do_filp_open+0x198/0x38c fs/namei.c:3865 do_sys_openat2+0x134/0x3fc fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __arm64_sys_openat+0x11c/0x150 fs/open.c:1347 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 -> #1 (&ei->i_data_sem){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x720/0x160c fs/ext4/inode.c:674 mpage_map_one_extent fs/ext4/inode.c:2437 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2490 [inline] ext4_writepages+0x10a4/0x29f0 fs/ext4/inode.c:2859 do_writepages+0x2c4/0x50c mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x157c fs/fs-writeback.c:1688 writeback_sb_inodes+0x870/0x1470 fs/fs-writeback.c:1979 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2050 wb_writeback+0x420/0xfdc fs/fs-writeback.c:2155 wb_check_background_flush fs/fs-writeback.c:2221 [inline] wb_do_writeback fs/fs-writeback.c:2309 [inline] wb_workfn+0xb40/0xe18 fs/fs-writeback.c:2336 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 wait_transaction_locked+0x184/0x23c fs/jbd2/transaction.c:177 add_transaction_credits+0x104/0xaf0 fs/jbd2/transaction.c:-1 start_this_handle+0x4dc/0x125c fs/jbd2/transaction.c:422 jbd2__journal_start+0x288/0x530 fs/jbd2/transaction.c:520 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:559 ocfs2_start_trans+0x398/0x6f4 fs/ocfs2/journal.c:376 ocfs2_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 ocfs2_commit_truncate+0x880/0x1980 fs/ocfs2/alloc.c:7353 ocfs2_truncate_for_delete fs/ocfs2/inode.c:672 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:839 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1128 [inline] ocfs2_evict_inode+0x15fc/0x3df0 fs/ocfs2/inode.c:1268 evict+0x3d8/0x81c fs/inode.c:703 iput_final fs/inode.c:1832 [inline] iput+0x728/0x7e8 fs/inode.c:1858 do_unlinkat+0x35c/0x504 fs/namei.c:4452 __do_sys_unlinkat fs/namei.c:4488 [inline] __se_sys_unlinkat fs/namei.c:4481 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4481 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 other info that might help us debug this: Chain exists of: jbd2_handle --> sb_internal#3 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&journal->j_trans_barrier); lock(sb_internal#3); lock(&journal->j_trans_barrier); lock(jbd2_handle); *** DEADLOCK *** 6 locks held by syz-executor/4332: #0: ffff0000cd05c460 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:402 #1: ffff0000cdc60ab0 (&osb->nfs_sync_rwlock){.+.+}-{3:3}, at: ocfs2_nfs_sync_lock+0xf4/0x254 fs/ocfs2/dlmglue.c:2874 #2: ffff0000e23042c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #2: ffff0000e23042c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:825 [inline] #2: ffff0000e23042c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1128 [inline] #2: ffff0000e23042c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_evict_inode+0x1408/0x3df0 fs/ocfs2/inode.c:1268 #3: ffff0000e2305f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #3: ffff0000e2305f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_remove_btree_range+0x56c/0x12e8 fs/ocfs2/alloc.c:5742 #4: ffff0000cd05c650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 #5: ffff0000f3599ce8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374 stack backtrace: CPU: 1 PID: 4332 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2088 check_noncircular+0x290/0x370 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790 wait_transaction_locked+0x184/0x23c fs/jbd2/transaction.c:177 add_transaction_credits+0x104/0xaf0 fs/jbd2/transaction.c:-1 start_this_handle+0x4dc/0x125c fs/jbd2/transaction.c:422 jbd2__journal_start+0x288/0x530 fs/jbd2/transaction.c:520 jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:559 ocfs2_start_trans+0x398/0x6f4 fs/ocfs2/journal.c:376 ocfs2_remove_btree_range+0x6b0/0x12e8 fs/ocfs2/alloc.c:5752 ocfs2_commit_truncate+0x880/0x1980 fs/ocfs2/alloc.c:7353 ocfs2_truncate_for_delete fs/ocfs2/inode.c:672 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:839 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1128 [inline] ocfs2_evict_inode+0x15fc/0x3df0 fs/ocfs2/inode.c:1268 evict+0x3d8/0x81c fs/inode.c:703 iput_final fs/inode.c:1832 [inline] iput+0x728/0x7e8 fs/inode.c:1858 do_unlinkat+0x35c/0x504 fs/namei.c:4452 __do_sys_unlinkat fs/namei.c:4488 [inline] __se_sys_unlinkat fs/namei.c:4481 [inline] __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4481 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589 ocfs2: Unmounting device (7,1) on (node local) XFS (loop1): Unmounting Filesystem